Shank, the side-scrolling beat-and-slash-em-up out this week, runs like a dream on the PS3 but is having some stuttering issues with its cinematics on the Xbox 360. The game's developer says older models of that console are the problem.

"Older Xbox 360's have slower disc access rates, so the opening cinematic chugs, and loading between levels takes longer," writes Jamie Cheng, Klei's CEO. "When we tested this on development kits, this never came up so that took us completely by surprise, and we're looking into it."

Cheng notes that gameplay itself doesn't suffer from any chugging, stuttering or slowness, just the interstitials.

They're also aware that some folks haven't collected two achievements if they unlock the game's trial version on the 360. "We've already got a fix for this, so when it comes in, you'll automatically get your achievements," Cheng writes.

Update: The official site has a new update that states, "I want to be clear: this is definitely not the 360's "fault". It's our own issue, and it took us by surprise because it didn't come up during certification. Time for us to go a-fixing!"